Android apps

SuperBeam is the easiest and fastest way to share large files between Android devices using WiFi direct. Devices can be paired using QR codes (with the included QR code scanner) , NFC or manual sharing key (PRO).

Turns your phone into a Mobile Hotspot – no rooting or tether plan required. If WiFi mode is not supported on your phone model you can also fall back to USB mode or Bluetooth mode instead using the included PdaNet feature.

Quickly capture what’s on your mind and get a reminder later at the right place or time. Speak a voice memo on the go and have it automatically transcribed. Grab a photo of a poster, receipt or document and easily organize or find it later in search. Google Keep makes it easy to capture a thought or list for yourself, and share it with friends and family.

I think it is well known app, I dont have to write much. I have switched from SMS to WhatsApp to send and receive messages, calls, photos, videos, and Voice Messages.

Viber is similar to whatsapp, however it first introduced free calling feature. They also have a feature Viber Out, it can be used to make calls to non-Viber mobile and landline numbers at low rates.